I have a lot of sweats, that i got in stock by accident. i want to sell them at 50%, and made af new product. - I have filled out the stock item list, and only want to sell what i have in stock. - but when i test frontend, i can put more items in the basked, then i have in stock. is it possible to do, so customers cant order more, than I have in stock. ?

We don't currently expose on hand inventory to the front-end. I would suggest checking the ideas page to see if an existing idea is there to vote on or raise a new one so we can consider implementing this in the future.